Detectives and neighbourhood officers stopped motorists and carried out door-to-door enquiries in the Aldershot Road area of the town on Monday afternoon, as part of continuing efforts to establish the circumstances surrounding the incident that led to the 24-year-old suffering fatal stab wounds.

He was pronounced dead at the Royal Surrey County Hospital on Monday February 2 after being driven there in a van.

Surrey Police said an altercation had earlier taken place in Aldershot Road involving the occupants of a black Vauxhall Corsa and a dark coloured van.

Detective Chief Inspector Mark Preston said: “This was a tragic incident where a young man lost his life and our thoughts and sympathies remain with his family and friends at this difficult time.

“I hope our anniversary visit to the Aldershot Road area will encourage anyone who may have been in the vicinity on the afternoon of Monday February 2, and has not yet spoken to police, to come forward.

"We have made a number of arrests and a man has been charged in connection with the incident, but officers are continuing to carry out a thorough and extensive investigation into this extremely serious offence."

DCI Preston said Mr Sommerville's death had had a "profound impact on the local community".

"We will continue to have officers in the area to support and update residents," he added.

"I would ask anyone who was in the Aldershot Road area a week ago and may have seen the two vehicles or the altercation taking place to contact police as a matter of urgency.”

Nathaniel Johnson, 24, from Barkworth Road, south-east London, has been charged with Mr Sommerville's murder and is next due to appear at Guildford Crown Court on April 24.

A 28-year-old woman who was arrested on suspicion of assisting an offender and a 24-year-old man who was quizzed on suspicion of perverting the course of justice have both been released on bail until February 11.

A 31-year-old woman and a 37-year-old woman who were also arrested have since been released with no further action taken.

Anyone who can help with the investigation is asked to call Surrey Police on 101, quoting reference 45150009206, or contact Crimestoppers anonymously on 0800 555 111.